Phytochrome-mediated growth inhibition of seminal roots in rice seedlings

In rice (Oryza sativa) seedlings, continuous white-light irradiation inhibited the growth of seminal roots but promoted the growth of crown roots. In this study, we examined the mechanisms of photoinhibition of seminal root growth. Photoinhibition occurred in the absence of nitrogen but increased wi...

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Veröffentlicht in:Physiologia plantarum 2009-11, Vol.137 (3), p.289-297
Hauptverfasser: Shimizu, Hisayo, Tanabata, Takanari, Xie, Xianzhi, Inagaki, Noritoshi, Takano, Makoto, Shinomura, Tomoko, Yamamoto, Kotaro T
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container_end_page 297
container_issue 3
container_start_page 289
container_title Physiologia plantarum
container_volume 137
creator Shimizu, Hisayo
Tanabata, Takanari
Xie, Xianzhi
Inagaki, Noritoshi
Takano, Makoto
Shinomura, Tomoko
Yamamoto, Kotaro T
description In rice (Oryza sativa) seedlings, continuous white-light irradiation inhibited the growth of seminal roots but promoted the growth of crown roots. In this study, we examined the mechanisms of photoinhibition of seminal root growth. Photoinhibition occurred in the absence of nitrogen but increased with increasing nitrogen concentrations. In the presence of nitrogen, photoinhibition was correlated with coiling of the root tips. The seminal roots were most photosensitive 48-72 h after germination during the 7-day period after germination. White-light irradiation for at least 6 h was required for photoinhibition, and the Bunsen-Roscoe law of reciprocity was not observed. Experiments with phytochrome mutants showed that far-red light was perceived exclusively by phyA, red light was perceived by both phyA and phyB, and phyC had little or no role in growth inhibition or coiling of the seminal roots. These results also suggest that other blue-light photoreceptors are involved in growth inhibition of the seminal roots. Fluence-response curve analyses showed that phyA and phyB control very low-fluence response and low-fluence response, respectively, in the seminal roots. This was essentially the same as the growth inhibition previously observed at the late stage of coleoptile development (80 h after germination). The photoperceptive site for the root growth inhibition appeared to be the roots themselves. All three phytochrome species of rice were detected immunochemically in roots.
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Fluence-response curve analyses showed that phyA and phyB control very low-fluence response and low-fluence response, respectively, in the seminal roots. This was essentially the same as the growth inhibition previously observed at the late stage of coleoptile development (80 h after germination). The photoperceptive site for the root growth inhibition appeared to be the roots themselves. All three phytochrome species of rice were detected immunochemically in roots.</description><identifier>ISSN: 0031-9317</identifier><identifier>EISSN: 1399-3054</identifier><identifier>DOI: 10.1111/j.1399-3054.2009.01277.x</identifier><identifier>PMID: 19744160</identifier><identifier>CODEN: PHPLAI</identifier><language>eng</language><publisher>Oxford, UK: Oxford, UK : Blackwell Publishing Ltd</publisher><subject>Biological and medical sciences ; Culture Media ; Fundamental and applied biological sciences. 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subjects Biological and medical sciences
Culture Media
Fundamental and applied biological sciences. Psychology
Light
Mutation
Nitrogen - metabolism
Oryza - genetics
Oryza - growth & development
Oryza - radiation effects
Oryza sativa
Phytochrome - metabolism
Plant physiology and development
Plant Roots - genetics
Plant Roots - growth & development
Seedlings - genetics
Seedlings - growth & development
title Phytochrome-mediated growth inhibition of seminal roots in rice seedlings
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